cold water pressure low in new faucet

Plumber installed new faucet, the cold water worked fine for 4 days then pressure dropped to less than 50% Kholer sent new valve, no difference. They had us switch the cold line to the hot to see if it would work--it did. Tried hot water tubing on cold but same result low pressure. Kholer says not their problem. Ideas?

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cold water pressure low in new faucet

Sounds like loose floating debris in the cold side of the faucet.
Turn the water off, dismantle the faucet and cover it with a towel.
Turn the water back on very briefly to flush the debris out of the faucet body. That should clear it. Been there. Done that.
Sometimes, you have to take a small Phillips head screwdriver or an icepick to break up the little hungup piece of debris so that it will flush out.
Good Luck!
Mike